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Heaviness;pain;swelling ;loss of hearing is a after effect of cold
in few people .It is a sort of inflammation due to infection of middle ear & is called Otitis Media
.The ear drum swells & you get loss of hearing partial or complete on one side.After few days & treatment it subsibes & the process is mostly reversible.Your doctor has prescribed Loratidine as a anti histaminic to reduce the severity of cold you had so that the complication or after effect can be under control .The best thing you can do is please consult a ENT specialist
who will examine your ear & prescribe the required medicines like painkiller & anti inflammatory;he may even ask you to continue the loratidine ;and if it is necessary he will advise a antibiotic orally Or even locally as drops.After the treatment you should be fine in a few days.
Wish you speedy recovery .